Legal claims defining the scope of protection. Each claim is shown in both the original legal language and a plain English translation.
1. A display device with a capacitive touch panel, comprising: a display panel; a cover layer; and a laminate between the display panel and the cover layer, the laminate having: a first conductive layer; a second conductive layer that is positioned further from the cover layer than is the first conductive layer, the first conductive layer and the second conductive layer being arranged apart from each other in a stacking direction so as to form a capacitive touch sensor; and a circularly polarizing plate having: a polarizing plate that is positioned further from the cover layer than are the first conductive layer and the second conductive layer, the polarizing plate having: a polarizing film; and a cover layer-side protective film that is formed on a side of the polarizing film facing the cover layer; and a substrate positioned further from the cover layer than is the polarizing plate, the substrate having an optical film with a phase difference of λ/4, a slow axis of the optical film intersecting a transmission axis of the polarizing film at an angle of about 45° as viewed in the stacking direction, wherein the second conductive layer is formed on a surface of the cover layer-side protective film facing the cover layer.
This invention relates to a display device with an integrated capacitive touch panel, addressing the challenge of combining touch sensing functionality with optical performance in a compact design. The device includes a display panel, a cover layer, and a laminate structure between them. The laminate contains two conductive layers forming a capacitive touch sensor, where the first conductive layer is closer to the cover layer than the second. A circularly polarizing plate is positioned further from the cover layer than the conductive layers. The polarizing plate consists of a polarizing film and a protective film on the cover layer side, with the second conductive layer deposited on the inner surface of this protective film. The polarizing plate also includes a substrate with an optical film having a λ/4 phase difference, where the optical film's slow axis intersects the polarizing film's transmission axis at approximately 45 degrees. This configuration ensures touch sensitivity while maintaining optical properties for display performance. The design integrates touch sensing and polarization functions without increasing thickness, optimizing space efficiency in display devices.
2. The display device with a capacitive touch panel according to claim 1 , wherein the first conductive layer is formed on a surface of the cover layer facing the display panel, the polarizing film is positioned on a surface of the polarizing plate facing the display panel, the substrate is bonded to a surface of the polarizing film facing the display panel, the optical film has a relative permittivity of 2 or more and 5 or less, and the optical film has a saturated water absorption of 0.01 mass % or less.
This invention relates to a display device with an integrated capacitive touch panel, addressing the challenge of improving touch sensitivity and durability while maintaining optical performance. The device includes a cover layer, a display panel, and a capacitive touch panel structure sandwiched between them. The first conductive layer, part of the touch panel, is formed on the inner surface of the cover layer facing the display panel. A polarizing plate is positioned adjacent to the display panel, with a polarizing film on its inner surface. A substrate is bonded to the polarizing film, and an optical film is integrated into the stack. The optical film has a relative permittivity between 2 and 5, ensuring efficient capacitive sensing, and a saturated water absorption of 0.01 mass % or less, enhancing moisture resistance. The design optimizes touch responsiveness by minimizing parasitic capacitance and signal interference while maintaining optical clarity and structural integrity. The materials and layer arrangement prevent degradation from environmental factors, extending the device's lifespan. This configuration is particularly useful in high-performance touchscreens for smartphones, tablets, and other interactive displays.
3. The display device with a capacitive touch panel according to claim 1 , wherein the optical film is an obliquely stretched film.
A display device with a capacitive touch panel includes an optical film positioned between a display panel and the touch panel. The optical film is an obliquely stretched film, meaning it is stretched at an angle relative to the display panel to improve optical properties such as reducing glare, enhancing contrast, or improving viewing angles. The touch panel detects touch inputs by sensing changes in capacitance when a user interacts with the screen. The obliquely stretched film helps maintain touch sensitivity while optimizing light transmission and reducing reflections. This design ensures clear visibility and accurate touch detection, addressing issues like glare and poor contrast in bright environments. The film's oblique stretching aligns with the display's polarization or light-emitting layers to enhance performance. The device may also include additional layers like a polarizer or adhesive layers to integrate the film with the display and touch panel. The obliquely stretched film improves optical efficiency without interfering with touch functionality, making it suitable for high-performance displays in smartphones, tablets, and other touch-sensitive devices.
4. The display device with a capacitive touch panel according to claim 1 , wherein the optical film is formed from a cycloolefin polymer, polycarbonate, polyethylene terephthalate, or triacetylcellulose.
A display device with a capacitive touch panel includes an optical film positioned between a display panel and the touch panel. The optical film is designed to reduce interference between the touch panel and the display panel, improving touch sensitivity and display quality. The optical film is formed from materials such as cycloolefin polymer, polycarbonate, polyethylene terephthalate, or triacetylcellulose. These materials provide optical clarity, durability, and compatibility with the capacitive touch panel, ensuring reliable touch detection while maintaining high image quality. The film's properties help minimize signal distortion and enhance the overall performance of the touch-sensitive display. This design is particularly useful in applications where touch responsiveness and visual clarity are critical, such as smartphones, tablets, and other interactive electronic devices. The use of specific polymer materials ensures the film meets the required optical and mechanical properties for seamless integration with the display and touch panel components.
5. The display device with a capacitive touch panel according to claim 1 , wherein the first conductive layer and the second conductive layer are formed by using indium oxide, carbon nanotubes, or silver nanowires.
A display device with a capacitive touch panel includes a first conductive layer and a second conductive layer that form part of the touch sensing mechanism. The first conductive layer is positioned on a substrate, while the second conductive layer is positioned on a cover glass. The first and second conductive layers are electrically connected to form a capacitive touch sensor that detects touch inputs by measuring changes in capacitance. The device also includes a display panel, such as an LCD or OLED, positioned between the substrate and the cover glass. The first and second conductive layers are made from materials such as indium oxide, carbon nanotubes, or silver nanowires, which provide high conductivity and transparency. These materials enable efficient touch sensing while maintaining optical clarity for the display. The use of these conductive materials allows for flexible and durable touch panels that can be integrated into various display applications, including smartphones, tablets, and other electronic devices. The design ensures reliable touch detection while minimizing interference from the display panel.
6. The display device with a capacitive touch panel according to claim 1 , wherein the display panel comprises an organic EL display panel.
A display device with a capacitive touch panel incorporates an organic EL (electroluminescent) display panel. Organic EL displays are known for their high contrast, wide viewing angles, and fast response times, making them suitable for applications requiring vibrant color reproduction and energy efficiency. The capacitive touch panel allows for intuitive user interaction by detecting touch inputs through changes in capacitance when a conductive object, such as a finger, comes into contact with the panel. This integration enables a seamless and responsive touch-sensitive display system. The organic EL display panel provides self-emissive pixels, eliminating the need for a backlight, which reduces power consumption and enhances display performance. The capacitive touch panel is typically overlaid on the display panel, ensuring that touch inputs are accurately registered while maintaining high display quality. This combination is particularly useful in portable electronic devices, such as smartphones, tablets, and wearable displays, where both high-performance visual output and touch responsiveness are critical. The technology addresses the need for compact, energy-efficient, and highly interactive display solutions in modern consumer electronics.
7. The display device with a capacitive touch panel according to claim 1 , wherein the display device has no index matching layer.
A display device with a capacitive touch panel is designed to detect touch inputs by sensing changes in capacitance. The device includes a display panel and a capacitive touch panel integrated with the display panel. The touch panel has a transparent conductive layer that forms a sensing electrode for detecting touch inputs. The display panel includes a color filter substrate, a thin-film transistor (TFT) substrate, and a liquid crystal layer sandwiched between them. The TFT substrate has a color filter layer, a black matrix layer, and a transparent conductive layer that serves as a common electrode. The transparent conductive layer of the touch panel and the common electrode of the display panel are electrically connected to form a single layer, simplifying the structure and reducing manufacturing costs. The display device lacks an index matching layer, which is typically used to reduce optical interference between the touch panel and the display panel. Eliminating this layer reduces material costs and simplifies assembly while maintaining optical clarity. The device ensures reliable touch detection and display functionality without the need for additional optical compensation layers.
8. The display device with a capacitive touch panel according to claim 1 , wherein the optical film is a cycloolefin polymer without a polar group.
A display device with a capacitive touch panel incorporates an optical film made of a cycloolefin polymer lacking polar groups. This design addresses issues related to signal interference and performance degradation in touch-sensitive displays. Cycloolefin polymers are known for their optical clarity, durability, and resistance to environmental factors, but traditional versions often contain polar groups that can interfere with capacitive touch sensing by absorbing moisture or interacting with electric fields. By using a non-polar cycloolefin polymer, the optical film minimizes signal distortion, ensuring accurate touch detection while maintaining high optical transparency. The film is positioned between the touch panel and the display to enhance light transmission and protect the underlying components. This configuration improves the reliability of touch interactions in various environmental conditions, such as humidity or temperature fluctuations, without compromising display quality. The absence of polar groups also reduces the risk of chemical interactions that could degrade the film over time, extending the device's lifespan. This innovation is particularly useful in high-performance displays, such as smartphones, tablets, and interactive kiosks, where touch responsiveness and optical clarity are critical.
Unknown
January 16, 2018
Browse 5M+ US patents with plain-English claim translations and AI-generated analysis.